51656546 has 4 divisors (see below), whose sum is σ = 77484822. Its totient is φ = 25828272.

The previous prime is 51656543. The next prime is 51656593. The reversal of 51656546 is 64565615.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 64565615 = 5 ⋅12913123.

It can be written as a sum of positive squares in only one way, i.e., 35343025 + 16313521 = 5945^2 + 4039^2 .

It is not an unprimeable number, because it can be changed into a prime (51656543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12914135 + ... + 12914138.

Almost surely, 2^51656546 is an apocalyptic number.

51656546 is a deficient number, since it is larger than the sum of its proper divisors (25828276).

51656546 is a wasteful number, since it uses less digits than its factorization.

51656546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25828275.

The product of its digits is 108000, while the sum is 38.

The square root of 51656546 is about 7187.2488477859. The cubic root of 51656546 is about 372.4275396194.

It can be divided in two parts, 5165 and 6546, that added together give a palindrome (11711).

The spelling of 51656546 in words is "fifty-one million, six hundred fifty-six thousand, five hundred forty-six".